Java File Write via ByteBuffer writeDataLengthsToHeader(FileOutputStream fpo)

Description

write Data Lengths To Header

License

Open Source License

Declaration

public static boolean writeDataLengthsToHeader(FileOutputStream fpo) 

Method Source Code

//package com.java2s;

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import java.nio.channels.FileChannel;

public class Main {
    public static boolean writeDataLengthsToHeader(FileOutputStream fpo) {
        long len;
        ByteBuffer bb = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN);
        FileChannel fc = fpo.getChannel();
        try {//from  w  w w .j a v a  2 s .  c om
            len = fc.size();

            fc.position(4);
            bb.putInt((int) (len - 8));
            bb.flip();
            fc.write(bb);

            fc.position(40);
            bb.clear();
            bb.putInt((int) (len - 44));
            bb.flip();
            fc.write(bb);
        } catch (IOException e) {
            System.err.println("error writing data lengths.");
            e.printStackTrace(System.err);
            return false;
        }
        return true;
    }
}

Related

1. write(SeekableByteChannel channel, long start, byte[] bytes)
2. write24BitInteger(int integer, ByteOrder order)
3. writeByte(WritableByteChannel channel, byte value)
4. writeBytes(Path file, byte[] bytes)
5. writeComment(File zipFile, String comment)
6. writeDelimitedToOutputStream(byte[] bytes, OutputStream outputStream)
7. writeDouble(BufferedWriter bw, double[] buf)
8. writeEmpty()
9. writeFC(String fname, float[] res)